However, the structure of chromatin also appears to serve a second, possibly more important role, in that it gives eukaryotic cells the capability to exert complex levels of control over gene ...

What have we learned about RNA structure and function so ... In comparison, eukaryotic cells contain two types of rRNA genes that give rise to four rRNA species: the 28S, 5.8S, 5S, and 18S rRNAs.

Scientists propose that the eukaryotic branch of this family tree formed when two prokaryotes, an ancient bacterium and archaeal cell, merged, forming a symbiotic relationship maintained over time. 1 ...